functional class name

https://doi.org/10.1351/goldbook.F02554
A name that expresses the characteristic group as a class term written as a separate word following the name of a parent structure or a name derived from a parent structure. In the latter case, when the derived name is that for a substituent group (formerly called a 'radical'), the method has been called 'radicofunctional nomenclature'.
Source:
Blue Book Guide, p. 14 [Terms] [Book]